Advanced Techniques

Povey, Malcolm J. W.

doi:10.1016/b978-012563730-5/50006-4

Cited by 88 publications

(101 citation statements)

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“…The strength of thermo-elastic scattering, which influences the strength of both backscattering and attenuation, is affected by the compressibility contrast between the liquid and solid phases (Povey, 1997) it is reasonable to conclude that this contrast is greater for suspensions of Honite glass particles than for Guyblast plastic particles, suggesting that compressibility is unlikely to be responsible for the differences between the measured and predicted values of the acoustic coefficients.…”

Section: Resultsmentioning

confidence: 89%

“…Factors other than the particle size distribution are present, in particular: differences in density, compressibility and particle shape between the two spherical glass species (Honite) and the two nonspherical plastic species (Guyblast) and quartz sand data of Thorne and Meral (2008) that were used to predict n. Density is accounted for explicitly in the model, through Eqs. (5) and (6), and it is interesting to note that the density contrast between the fluid and solid phases influences the strength of visco-inertial scattering (Povey, 1997).…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, a number of criteria must be considered when choosing the most appropriate measurement technique, such as potential hazards, physical size, ease of use and versatility, intrusiveness, cost, and the kind and accuracy of flow data that are required (Admiraal and Garc ıa, 2000;Hultmark et al, 2010;Laufer, 1954;Lemmin and Rolland, 1997;Povey, 1997). Acoustic instruments have many advantages over optical and other systems, most importantly their suitability for multiphase, sedimentladen, optically opaque flows, as well as their high mobility, ease of operation, low cost, low signal-processing, and calibration requirements and their ability to measure entire profiles, rather than make only single-point measurements.…”

Section: Introductionmentioning

confidence: 99%

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Measuring particle concentration in multiphase pipe flow using acoustic backscatter: Generalization of the dual-frequency inversion method

Rice

Fairweather

Hunter

et al. 2014

The Journal of the Acoustical Society of America

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A technique that is an extension of an earlier approach for marine sediments is presented for determining the acoustic attenuation and backscattering coefficients of suspensions of particles of arbitrary materials of general engineering interest. It is necessary to know these coefficients (published values of which exist for quartz sand only) in order to implement an ultrasonic dual-frequency inversion method, in which the backscattered signals received by transducers operating at two frequencies in the megahertz range are used to determine the concentration profile in suspensions of solid particles in a carrier fluid. To demonstrate the application of this dual-frequency method to engineering flows, particle concentration profiles are calculated in turbulent, horizontal pipe flow. The observed trends in the measured attenuation and backscatter coefficients, which are compared to estimates based on the available quartz sand data, and the resulting concentration profiles, demonstrate that this method has potential for measuring the settling and segregation behavior of real suspensions and slurries in a range of applications, such as the nuclear and minerals processing industries, and is able to distinguish between homogeneous, heterogeneous, and bed-forming flow regimes.

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Measuring particle concentration in multiphase pipe flow using acoustic backscatter: Generalization of the dual-frequency inversion method

Rice

Fairweather

Hunter

et al. 2014

The Journal of the Acoustical Society of America

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“…59,60,61 They have been demonstrated to accurately measured velocity and determine fundamental physical properties. Data can also, in the case of solids, be used to provide signatures that characterize properties, such as grain size, morphology and damage.…”

Section: Ultrasonic Transducersmentioning

confidence: 99%

New In-pile Instrumentation to Support Fuel Cycle Research and Development

Rempe¹,

MacLean²,

Schley³

et al. 2011

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SUMMARYNew and enhanced nuclear fuels are a key enabler for new and improved reactor technologies. For example, the goals of the next generation nuclear plant (NGNP) will not be met without irradiations successfully demonstrating the safety and reliability of new fuels. Likewise, fuel reliability has become paramount in ensuring the competitiveness of nuclear power plants. Recently, the Office of Nuclear Energy in the Department of Energy (DOE-NE) launched a new direction in fuel research and development that emphasizes an approach relying on first principle models to develop optimized fuel designs that offer significant improvements over current fuels. To facilitate this approach, high fidelity, real-time, data are essential for characterizing the performance of new fuels during irradiation testing. A three-year strategic research program has been initiated for developing the required test vehicles with sensors of unprecedented accuracy and resolution for obtaining the data needed to characterize three-dimensional changes in fuel microstructure during irradiation testing. When implemented, this strategy will yield test capsule designs that are instrumented with new sensor technologies for irradiations at facilities primarily relied upon by the Fuel Cycle Research and Development (FCR&D) program, the Advanced Test Reactor (ATR) and the High Flux Isotope Reactor (HFIR). Prior laboratory testing, and as needed, irradiation testing of sensors in these capsules will have been completed to give sufficient confidence that the irradiation tests will yield the required data.From the onset of this instrumentation development effort, it was recognized that obtaining these sensors must draw upon the expertise of a wide-range of organizations not currently supporting nuclear fuels research. Hence, a draft version of this document was developed to provide necessary background information related to fuel irradiation testing, desired parameters for detection, and an overview of currently available in-pile instrumentation. Then, a workshop was held in which U.S. and foreign experts from fuels, irradiation, and instrumentation fields participated. Prior to this workshop, copies of a draft version of this document were distributed to participants to stimulate expert interactions at this meeting. During the workshop, candidate sensor technologies identified in this document were discussed and ranked by the experts using agreed upon criteria. The final version of this document describes the consensus reached during the workshop with respect to recommendations for the path forward for accomplishing the goals of this research program.Based on the activities completed to develop this strategic plan, it is recommended that the FCR&D instrumentation development program be initiated as a three year program that includes the following three tasks:• Ultrasonics-Based Evaluations -In this task, laboratory evaluations and necessary irradiations will be completed to demonstrate the viability of this technology for in-pile applications. Specif...

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“…This phenomenon is widely used in non-destructive testing; where ultrasound is commonly used for inspection of cracks, internal flaws, and defects. There is a large body of work on the transmission, reflection, attenuation, and scattering of such acoustic waves in structures and liquids (see for example Kräutkramer & Kräutkramer 1975, Povey 1997.…”

Section: Introductionmentioning

confidence: 99%

The Application of Ultrasonic NDT Techniques in Tribology

Dwyer-Joyce

2005

Proceedings of the Institution of Mechanical Engineers, Part J:

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The use of ultrasonic reflection is emerging as a technique for studying tribological contacts. Ultrasonic waves can be transmitted non-destructively through machine components and their behaviour at an interface can describe characteristics of that contact. This paper is a review of the current state of understanding of the mechanisms of ultrasonic reflection at interfaces; and how this has been used to investigate the processes of dry rough surface contact and lubricated contact. The review extends to cover how ultrasound has been used to study the tribological function of certain engineering machine elements.

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Advanced Techniques

Cited by 88 publications

References 0 publications

Measuring particle concentration in multiphase pipe flow using acoustic backscatter: Generalization of the dual-frequency inversion method

Measuring particle concentration in multiphase pipe flow using acoustic backscatter: Generalization of the dual-frequency inversion method

New In-pile Instrumentation to Support Fuel Cycle Research and Development

The Application of Ultrasonic NDT Techniques in Tribology

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